Miniature relays: Difference between revisions

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In the 1970s, Tek produced their own '''miniature relays''' in-house that were used in some [[7000-series plug-ins]] such as the [[7A11]], [[7A12]], [[7A13]], [[7A14]], and other equipment. These relays have a tendency to fail and working ones have become very rare. Some of these relays have symmetrical socket layouts so that they can be installed in both possible 180° rotated positions.
In the 1970s, Tek produced their own '''miniature relays''' in-house that were used in some [[7000-series plug-ins]] such as the [[7A11]], [[7A12]], [[7A13]], [[7A14]], and other equipment.  
 
These relays have a tendency to fail and working spares have become very rare. Some of these relays have symmetrical socket layouts so that they can be installed in both possible 180° rotated positions.


Interestingly, Tek appears to have manufactured replacements based on commercial relays in TO-5 metal can cases soldered to small carrier boards with pins matching the Tek sockets.
Interestingly, Tek appears to have manufactured replacements based on commercial relays in TO-5 metal can cases soldered to small carrier boards with pins matching the Tek sockets.


Possible repair strategies include "micro-surgery" (Ref.1), installing modern miniature gold-contact relays on top of the cut-off base or, if energizing the coil mechanically operates the relay, using a signal source to cycle the relay for a period of time.
Possible repair strategies include "micro-surgery" (Ref.1), installing modern miniature gold-contact relays on top of the cut-off base or, if energizing the coil mechanically operates the relay, using a signal source to cycle the relay for a period of time.
Relays of the 148-0034-00 family have contacts with 100mil (2.54 mm) pitch; the housings are 16.0 x  8.3 x 15 mm (width x depths x height).
==Links==
{{Documents|Miniature relays}}


==Data==
==Data==
Line 20: Line 17:
! Note
! Note
|-
|-
| 108-0599-00 || SPST (reed) ||  ||  [[7T11]]:  A3K31,A3K32,A3K70,A3K71,A3K80  || ||
| [[108-0599-00]] || SPST (reed) ||  ||  [[7T11]]:  A3K31,A3K32,A3K70,A3K71,A3K80  || ||
|-
|-
| 148-0034-00 || DPDT ||  15 V 600 Ω  ||
| [[148-0034-00]] || DPDT ||  15 V, 600 Ω  ||
[[5A48]]: K190, K390
[[7A11]]: K401, K403, K405, K407, K411, K413, K415, K417, K431<br />
[[7A11]]: K401, K403, K405, K407, K411, K413, K415, K417, K431<br />
[[7A13]]: K47, K48, K480, K490<br />
[[7A13]]: K47, K48, K480, K490<br />
Line 29: Line 27:
[[7503]]: K521, K525 <br />
[[7503]]: K521, K525 <br />
[[7904]](A) Opt. 2: K802, K805, K812, K815  
[[7904]](A) Opt. 2: K802, K805, K812, K815  
|AXICOM V23079-D2003-B301 (Ref. 2)<br />[[Media:Omron G6 relay.jpg|Omron G6N, G6S]] ||
|AXICOM V23079-D2003-B301 (Ref. 2)<br />[[Media:Omron G6 relay.jpg|Omron G6N, G6S]] || Relays of the 148-0034-00 family have contacts with 100mil (2.54 mm) pitch; the housings are 16.0 x  8.3 x 15 mm (width x depths x height).
|-
|-
| 148-0034-01 || DPDT || 15 V 600 Ω  ||
| [[148-0034-01]]  || DPDT     || 15 V, 600 Ω  ||  
[[7A12]]: K7, K12, K15, K18<br />  
[[7A12]]: K7, K12, K15, K18<br />  
[[485]]: K879, K1242  
[[485]]: K879, K1242  
| || Same pinout as 148-0034-00 but longer leads bent outwards.
| || Same pinout as 148-0034-00 but longer leads bent outwards.
|-
|-
| 148-0034-02 || DPDT || 15 V 600 Ω  || [[7A12]]: K7 for B020000 up || || Same pinout as 148-0034-00 but longer leads bent outwards.
| [[148-0034-02]]  || DPDT     || 15 V, 600 Ω  || [[7A12]]: K7 for B020000 up         || || Same pinout as 148-0034-00 but longer leads bent outwards.
|-
|-
| 148-0034-03 || DPDT || 15 V 600 Ω  || [[7A11]] B100000+: K401, K403, K405, K407, K411, K413, K415, K417, K431 || AXICOM V23079-D2003-B301 (Ref. 2) ||
| [[148-0034-03]]  || DPDT     || 15 V, 600 Ω  || [[7A11]] B100000+: K401, K403, K405, K407, K411, K413, K415, K417, K431 || AXICOM V23079-D2003-B301 (Ref. 2) ||
|-
|-
| 148-0035-00 || SPDT || 15 V 600 Ω  || [[7A13]]: K60, K61<br /> [[7A14]]: K51, K52, K53, K155, K160, K180, K235, K280<br />[[7B70]], [[7B71]]: K3 || || Same pinout and coil data as 148-0050-00.
| [[148-0035-00]]  || SPDT     || 15 V, 600 Ω  ||
[[7A13]]: K60, K61<br />
[[7A14]]: K51, K52, K53, K155, K160, K180, K235, K280<br />
[[7B70]], [[7B71]]: K3
|   || Same pinout and coil data as 148-0050-00.
|-
|-
| [[148-0043-00]] || DPDT || 24 V 1325 Ω|| || ||
| [[148-0043-00]] || DPDT     || 24 V, 1325 Ω ||                                     || ||
|-
|-
| 148-0043-01 || DPDT || 24 V 1325 Ω|| || ||
| 148-0043-01     || DPDT     || 24 V, 1325 Ω ||                                     || ||
|-
|-
| 148-0044-00 || DPDT || 12 V 425 Ω|| || ||
| 148-0044-00     || DPDT     || 12 V, 425 Ω ||                                     || ||
|-
|-
| 148-0050-00 || SPDT || 15 V 600 Ω  || [[7A13]]: K10, K30 || || [[7A13]] manual erroneously calls them 12V DC relays. Print on relay identifies them as polarized, but they are not.  
| [[148-0050-00]]  || SPDT     || 15 V, 600 Ω  || [[7A13]]: K10, K30                 || || [[7A13]] manual erroneously calls them 12V DC relays. Print on relay identifies them as polarized, but they are not.  
|-  
|-  
| 148-0054-00 || SPDT+SPST || 15 V 600 Ω   || [[7A13]]: K7, K27 || ||
| [[148-0054-00]]  || SPDT+SPST || 15 V, 600 Ω || [[7A13]]: K7, K27                   || [[148-0107-04]] ||
|-
|-
| 148-0055-00 || SPDT+SPST || 15 V 600 Ω   || [[7A13]]: K6, K26 || ||
| [[148-0055-00]]  || SPDT+SPST || 15 V, 600 Ω || [[7A13]]: K6, K26                   || ||
|-
|-
| 148-0058-00 || ||  4 V 130 Ω   || [[7A11|7A11 Probe]]: K55, K59 || ||
| [[148-0058-00]]  ||           ||  4 V, 130 Ω || [[7A11|7A11 Probe]]: K55, K59       || ||
|-
|-
| 148-0059-00 || DPDT || 9.5 V 115 Ω   ||   || ||
| 148-0059-00     || DPDT     || 9.5 V, 115 Ω ||                                     || ||
|-
|-
| 148-0063-00 || DPDT || 15 V 600 Ω     || [[7A12]]: K5  || || Internally connected. Labled "Alt throw relay" in [[7A12]] manual.
| [[148-0063-00]]  || DPDT     || 15 V, 600 Ω || [[7A12]]: K5  || || Internally connected. Labled "Alt throw relay" in [[7A12]] manual.
|-
|-
| 148-0076-00 || SPST (reed) ||   ||   [[7L12]]: K1470   || ||
| [[148-0076-00]]  || SPST     ||             || [[7L12]]: K1470                     || || reed contact
|-
|-
| [[148-0080-00]] || DPDT || 5 V at 65 Ω ||     || ||
| [[148-0080-00]] || DPDT     || 5 V, 65 Ω   ||                                     || ||
|-
|-
| 148-0086-00 || || || [[11A32]]: A1K840 || ||
| [[148-0086-00]]  ||           ||             || [[11A32]]: A1K840                   || ||
|-
|-
| 148-0087-00 || SPDT || 90 mW || [[7L12]]: K300, K353, K356, K1200  || ||
| [[148-0088-00]]  ||           ||             || [[L1]]: K108, K118, K128, K138      || [[148-0107-xx]] ||
|-
|-
| 148-0088-00 || DPDT || 15 V 1 kΩ ||  
| [[148-0087-00]]  || SPDT      || 90 mW        || [[7L12]]: K300, K353, K356, K1200  || ||
|-
| [[148-0088-00]]  || DPDT     || 15 V, 1 kΩ   ||  
[[7L12]]: K281, K354, K355, K357, K1130, K1400, K1450 <br />  
[[7L12]]: K281, K354, K355, K357, K1130, K1400, K1450 <br />  
[[L1]] K108, K118, K128, K138 <br />  
[[L1]]: K108, K118, K128, K138 <br />  
[[L2]] K308, K318, K328, K338  
[[L2]]: K308, K318, K328, K338  
| || Same pinout as 148-0034-00. [[7L12]] manual claims "120 mW", but print on relay (and measurement) says 15V 1000 Ω which is 225 mW.
| || Same pinout as 148-0034-00. [[7L12]] manual claims "120 mW", but print on relay (and measurement) says 15 V 1000 Ω which is 225 mW.
|-
|-
| 148-0107 || DPDT || 18 V 880 Ω || TO5 replacement for 148-0088-00   || || Based on Hi-G MAW-169 7815 / Teledyne 412-6841, found in [[L1]]. The last two digits of the Tek part number are missing. Coil labeled 18V dc, 880 Ω
| 148-0107-??      || DPDT     || 18 V, 880 Ω || Hermetic TO-5 replacement for 148-0088-00                     ||       || Based on Hi-G MAW-169 7815 / Teledyne 412-6841, found in [[L1]]. The last two digits of the Tek part number are missing. Coil labeled 18 V DC, 880 Ω
|-
|-
| 148-0107-03 || SPDT || || TO5 replacement   || ||
| 148-0107-03     || SPDT     ||             || Hermetic TO-5 replacement                                     ||       ||
|-
|-
| 148-0107-04 || DPDT ||     || TO5 replacement for 148-0054-00 ([[7A13]]: K7, K27)  || ||  
| 148-0107-04     || DPDT     ||             || Hermetic TO-5 replacement for 148-0054-00 ([[7A13]]: K7, K27)  ||       ||  
|-
|-
| 148-0140-00 || Actuator ||     || [[:Category:2400 series scopes|2400 series]]   ||   ||
| [[148-0140-00]]  || Actuator ||             || [[:Category:2400 series scopes|2400 series]]                   ||  n/a  ||
|-
| [[148-0145-00]]  || Actuator  || 7 V(?), 38 Ω || [[7A42]] (five each in four [[119-1517-00]] attenuators)      ||  n/a  ||
|-
| [[148-0204-00]]  || Actuator  ||              || [[11A33]] attenuators                                          || n/a  ||
|-
|-
|}
|}
''to be expanded''  
''to be expanded''  


==Links==
==Links==
* [[Patent US 3519966A]]
* [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos)
* [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos)
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A11.htm 7A11 repair report at amplifier.cd]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A11.htm 7A11 repair report at amplifier.cd]
Line 95: Line 99:
* [https://groups.io/g/TekScopes/message/119028 "... used a function generator to actuate it for a few hours which restored proper operation."]
* [https://groups.io/g/TekScopes/message/119028 "... used a function generator to actuate it for a few hours which restored proper operation."]
* [[Media:Tektronix_Common_Design_Parts_Electro-Mechanical_Catalog_4_jan_1989_ocr.pdf|1989 Electro-Mechanical Catalog]] (OCR)
* [[Media:Tektronix_Common_Design_Parts_Electro-Mechanical_Catalog_4_jan_1989_ocr.pdf|1989 Electro-Mechanical Catalog]] (OCR)
{{PatentLinks|Miniature relays}}


==Pictures==
==Pictures==
'''8-pin miniature relays'''
<gallery>
<gallery>
148-0034-03.jpg | 148-0034-03 in [[7A11]]
148-0034-03.jpg | 148-0034-03 in [[7A11]]
Line 125: Line 131:
Tek 148-0055-00 4.jpg|148-0055-00
Tek 148-0055-00 4.jpg|148-0055-00
0054-0055_comp.jpg|148-0054-00 vs. 148-0055-00
0054-0055_comp.jpg|148-0054-00 vs. 148-0055-00
Omron G6 relay.jpg | replacement Omron G6 relay soldered onto Tek socket
7a11-probe-interior-back.jpg | Two 148-0058-00 in the [[7A11]] probe
</gallery>
'''Bistable relay actuators'''
<gallery>
Tek 11a33 inputrelay.jpg              | Bi-stable relay yoke actuating contacts in [[11A33]] front-end (148-0204-00)
Tek 148-0128-00 1.jpg                | [[148-0128-00]] relay yoke
148-0140-00.jpg                      | 148-0140-00
148-0140-00 frame.jpg                | Three 148-0140-00 in a frame
119-1445-02.jpg                      | 148-0140-00s in [[119-1445-02]] attenuator (2400 series)
148-0140-00 in 2424L attenuator.jpg  | 148-0140-00s in attenuator
148-0145-00 1.jpg                    | [[148-0145-00]] from [[7A42]]
148-0145-00 2.jpg                    | 148-0145-00 from [[7A42]]
148-0145-00 3.jpg                    | 148-0145-00 from [[7A42]], view from bottom
</gallery>
'''Hermetic commercial relays'''
<gallery>
148-0107_Top.jpg|148-0107 TO-5 replacement relay  
148-0107_Top.jpg|148-0107 TO-5 replacement relay  
148-0107_Top2.jpg|148-0107 TO-5 replacement relay  
148-0107_Top2.jpg|148-0107 TO-5 replacement relay  
Line 130: Line 153:
148-0107_side2.jpg|148-0107 TO-5 replacement relay  
148-0107_side2.jpg|148-0107 TO-5 replacement relay  
tek-148-0107-4.jpg | 148-0107-04 TO-5 replacement relay  
tek-148-0107-4.jpg | 148-0107-04 TO-5 replacement relay  
Omron G6 relay.jpg | replacement Omron G6 relay soldered onto Tek socket
Tek_148-0129-01_1.jpeg | 148-0129-01
7a11-probe-interior-back.jpg | Two 148-0058-00 in the [[7A11]] probe
Tek_148-0129-01_2.jpeg | 148-0129-01 in [[485]] attenuator
</gallery>
</gallery>
====Other custom relays in Tek equipment====
'''Other custom relays in Tek equipment'''
<gallery>
<gallery>
108-0599-00 reed relays in 7T11.jpg | 108-0599-00 reed relays in [[7T11]]
108-0599-00 reed relays in 7T11.jpg | 108-0599-00 reed relays in [[7T11]]
Tek 11a33 inputrelay.jpg | Bi-stable relay yoke actuating contacts in [[11A33]] front-end (148-0204-00)
Tek 148-0128-00 1.jpg | [[148-0128-00]] relay yoke
Tek 262 program card relay1.jpg| 11PST reed relay on [[262]] program cards
Tek 262 program card relay1.jpg| 11PST reed relay on [[262]] program cards
Tek 262 program card front.jpg | 11PST reed relay on [[262]] program cards (top right)
Tek 262 program card front.jpg | 11PST reed relay on [[262]] program cards (top right)
maglatch.jpg | Mag Latch Relay (from 1987 catalog)
maglatch.jpg | Mag Latch Relay (from 1987 catalog)
148-0140-00.jpg  | 148-0140-00
148-0140-00 frame.jpg | Three 148-0140-00 in a frame
119-1445-02.jpg | 148-0140-00s in [[119-1445-02]] attenuator (2400 series)
148-0140-00 in 2424L attenuator.jpg | 148-0140-00s in attenuator
Tek_148-0129-01_1.jpeg | 148-0129-01
Tek_148-0129-01_2.jpeg | 148-0129-01 in [[485]] attenuator
</gallery>
</gallery>
* [[7A29]] input protection relay
* [[7A29]] input protection relay

Latest revision as of 04:21, 29 August 2024

In the 1970s, Tek produced their own miniature relays in-house that were used in some 7000-series plug-ins such as the 7A11, 7A12, 7A13, 7A14, and other equipment.

These relays have a tendency to fail and working spares have become very rare. Some of these relays have symmetrical socket layouts so that they can be installed in both possible 180° rotated positions.

Interestingly, Tek appears to have manufactured replacements based on commercial relays in TO-5 metal can cases soldered to small carrier boards with pins matching the Tek sockets.

Possible repair strategies include "micro-surgery" (Ref.1), installing modern miniature gold-contact relays on top of the cut-off base or, if energizing the coil mechanically operates the relay, using a signal source to cycle the relay for a period of time.

Data

Tek P/N Contacts Coil Used in Replacement Note
108-0599-00 SPST (reed) 7T11: A3K31,A3K32,A3K70,A3K71,A3K80
148-0034-00 DPDT 15 V, 600 Ω

5A48: K190, K390 7A11: K401, K403, K405, K407, K411, K413, K415, K417, K431
7A13: K47, K48, K480, K490
7A14: K50, K62, K330
7B70/7B71: K6, K44, K48, K138, K780
7503: K521, K525
7904(A) Opt. 2: K802, K805, K812, K815

AXICOM V23079-D2003-B301 (Ref. 2)
Omron G6N, G6S		 Relays of the 148-0034-00 family have contacts with 100mil (2.54 mm) pitch; the housings are 16.0 x 8.3 x 15 mm (width x depths x height).
148-0034-01 DPDT 15 V, 600 Ω

7A12: K7, K12, K15, K18
485: K879, K1242

Same pinout as 148-0034-00 but longer leads bent outwards.
148-0034-02 DPDT 15 V, 600 Ω 7A12: K7 for B020000 up Same pinout as 148-0034-00 but longer leads bent outwards.
148-0034-03 DPDT 15 V, 600 Ω 7A11 B100000+: K401, K403, K405, K407, K411, K413, K415, K417, K431 AXICOM V23079-D2003-B301 (Ref. 2)
148-0035-00 SPDT 15 V, 600 Ω

7A13: K60, K61
7A14: K51, K52, K53, K155, K160, K180, K235, K280
7B70, 7B71: K3

Same pinout and coil data as 148-0050-00.
148-0043-00 DPDT 24 V, 1325 Ω
148-0043-01 DPDT 24 V, 1325 Ω
148-0044-00 DPDT 12 V, 425 Ω
148-0050-00 SPDT 15 V, 600 Ω 7A13: K10, K30 7A13 manual erroneously calls them 12V DC relays. Print on relay identifies them as polarized, but they are not.
148-0054-00 SPDT+SPST 15 V, 600 Ω 7A13: K7, K27 148-0107-04
148-0055-00 SPDT+SPST 15 V, 600 Ω 7A13: K6, K26
148-0058-00 4 V, 130 Ω 7A11 Probe: K55, K59
148-0059-00 DPDT 9.5 V, 115 Ω
148-0063-00 DPDT 15 V, 600 Ω 7A12: K5 Internally connected. Labled "Alt throw relay" in 7A12 manual.
148-0076-00 SPST 7L12: K1470 reed contact
148-0080-00 DPDT 5 V, 65 Ω
148-0086-00 11A32: A1K840
148-0088-00 L1: K108, K118, K128, K138 148-0107-xx
148-0087-00 SPDT 90 mW 7L12: K300, K353, K356, K1200
148-0088-00 DPDT 15 V, 1 kΩ

7L12: K281, K354, K355, K357, K1130, K1400, K1450
L1: K108, K118, K128, K138
L2: K308, K318, K328, K338

Same pinout as 148-0034-00. 7L12 manual claims "120 mW", but print on relay (and measurement) says 15 V 1000 Ω which is 225 mW.
148-0107-?? DPDT 18 V, 880 Ω Hermetic TO-5 replacement for 148-0088-00 Based on Hi-G MAW-169 7815 / Teledyne 412-6841, found in L1. The last two digits of the Tek part number are missing. Coil labeled 18 V DC, 880 Ω
148-0107-03 SPDT Hermetic TO-5 replacement
148-0107-04 DPDT Hermetic TO-5 replacement for 148-0054-00 (7A13: K7, K27)
148-0140-00 Actuator 2400 series n/a
148-0145-00 Actuator 7 V(?), 38 Ω 7A42 (five each in four 119-1517-00 attenuators) n/a
148-0204-00 Actuator 11A33 attenuators n/a

to be expanded

Links

Patents that may apply to Miniature relays

Page Title Inventors Filing date Grant date Links
Patent US 3519966A Electrical relay Tony Sprando • Richard L Sollars 1967-01-23 1970-07-07 Miniature relays

Pictures

8-pin miniature relays

  • 148-0034-03 in 7A11

    148-0034-03 in 7A11

  • 148-0034-xx connections (bottom view)

    148-0034-xx connections (bottom view)

  • 148-0034-00

    148-0034-00

  • 148-0034-00

    148-0034-00

  • 148-0034-xx (open)

    148-0034-xx (open)

  • 148-0034-xx (open)

    148-0034-xx (open)

  • 148-0034-02

    148-0034-02

  • 148-0034-02

    148-0034-02

  • 148-0034-03 bottom view

    148-0034-03 bottom view

  • 148-0035-00 in 7A13

    148-0035-00 in 7A13

  • 148-0035-00

    148-0035-00

  • 148-0035-00

    148-0035-00

  • 148-0035-00

    148-0035-00

  • 148-0035-00

    148-0035-00

  • 148-0035-00 connections

    148-0035-00 connections

  • 148-0050-00

    148-0050-00

  • 148-0050-00

    148-0050-00

  • 148-0050-00

    148-0050-00

  • 148-0050-00

    148-0050-00

  • 148-0035-00 vs. 148-0050-00

    148-0035-00 vs. 148-0050-00

  • 148-0054-00

    148-0054-00

  • 148-0054-00

    148-0054-00

  • 148-0055-00

    148-0055-00

  • 148-0055-00

    148-0055-00

  • 148-0055-00

    148-0055-00

  • 148-0055-00

    148-0055-00

  • 148-0054-00 vs. 148-0055-00

    148-0054-00 vs. 148-0055-00

  • replacement Omron G6 relay soldered onto Tek socket

    replacement Omron G6 relay soldered onto Tek socket

  • Two 148-0058-00 in the 7A11 probe

    Two 148-0058-00 in the 7A11 probe

Bistable relay actuators

  • Bi-stable relay yoke actuating contacts in 11A33 front-end (148-0204-00)

    Bi-stable relay yoke actuating contacts in 11A33 front-end (148-0204-00)

  • 148-0128-00 relay yoke

    148-0128-00 relay yoke

  • 148-0140-00

    148-0140-00

  • Three 148-0140-00 in a frame

    Three 148-0140-00 in a frame

  • 148-0140-00s in 119-1445-02 attenuator (2400 series)

    148-0140-00s in 119-1445-02 attenuator (2400 series)

  • 148-0140-00s in attenuator

    148-0140-00s in attenuator

  • 148-0145-00 from 7A42

    148-0145-00 from 7A42

  • 148-0145-00 from 7A42

    148-0145-00 from 7A42

  • 148-0145-00 from 7A42, view from bottom

    148-0145-00 from 7A42, view from bottom

Hermetic commercial relays

  • 148-0107 TO-5 replacement relay

    148-0107 TO-5 replacement relay

  • 148-0107 TO-5 replacement relay

    148-0107 TO-5 replacement relay

  • 148-0107 TO-5 replacement relay

    148-0107 TO-5 replacement relay

  • 148-0107 TO-5 replacement relay

    148-0107 TO-5 replacement relay

  • 148-0107-04 TO-5 replacement relay

    148-0107-04 TO-5 replacement relay

  • 148-0129-01

    148-0129-01

  • 148-0129-01 in 485 attenuator

    148-0129-01 in 485 attenuator

Other custom relays in Tek equipment

  • 108-0599-00 reed relays in 7T11

    108-0599-00 reed relays in 7T11

  • 11PST reed relay on 262 program cards

    11PST reed relay on 262 program cards

  • 11PST reed relay on 262 program cards (top right)

    11PST reed relay on 262 program cards (top right)

  • Mag Latch Relay (from 1987 catalog)

    Mag Latch Relay (from 1987 catalog)

  • 7A29 input protection relay
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